Sony VPL-ES4, Service Manual

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3-3
VPL-ES4/EX4
3-2. Power Board Troubleshooting
3-2-1. No Power
Check LED circuit of
main board.
No Power
No
Yes
F601
Open?
Yes
Q601(D-S)
Short ?
No
No
Yes
No
Output
5V DC
exists ?
Voltage
outputs shut
down and built
repeatly ?
Check if CN701 inserted
properly.
Check if miss to solder
any SMD type of
components.
Yes
Replace Q601 and F601
with new ones, and then
put power board into set.
If Q601 damages again,
check if other parts are
shorted.
Check if 15.25V or 12V
exist. If any voltage is
wrong, replace IC701 or
T602 with new ones.
Check if D602 or IC602 is
broken.
if yes,replace it with now
one.
Check CN701 and find
out if some points are
shorted to gound.